Linux and Chemistry - A collection of links to chemistry and other scientific software running on Linux.

Tom's Free Chemistry Software Reference - Frequently-updated searchable alphabetical index of free Chemistry software. Features a search engine.

The OpenScience Project: Chemistry - A collection of links for Open Source scientific software projects.

Chemistry Software and Information Resources (CSIR) - Information resource about the development and use of chemistry software. Includes a chemical software exchange and a directory of web sites and mailing lists.

Linux4Chemistry - An up-to-date directory of Linux software for chemistry. Lists more than 100 free and commercial programs.

Scientific Applications for Linux: Chemistry - Descriptions, screen shots, licensing information, and links for over 200 chemical programs for Linux.

Free Chemistry Software for Apple Macintosh - Categorized list and archive of freeware, shareware, and demos for the Mac.